Blockchain — resources

roadmap.sh: https://roadmap.sh/blockchain

Books

Mastering Bitcoin (Andreas Antonopoulos) — the definitive technical deep-dive into how Bitcoin works under the hood.
Mastering Ethereum (Antonopoulos & Wood) — companion volume covering Ethereum, the EVM and smart contracts in depth.
The Basics of Bitcoins and Blockchains (Antony Lewis) — accessible, jargon-light overview of the whole ecosystem.
Token Economy (Shermin Voshmgir) — clear explanation of tokens, Web3 and decentralized organizations.

Solidity docs — the official language reference and the source of truth for smart contract development.
CryptoZombies — gamified, hands-on course that teaches Solidity by building a game.
Ethereum.org developer portal — official docs, tutorials and tooling for building on Ethereum.
Foundry Book — official guide to the Foundry toolchain for testing and deploying contracts.